Document Detail


Lung microvascular pressure profile measured by micropuncture in anesthetized dogs.
MedLine Citation:
PMID:  3372444     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We have micropunctured the lung in the open thorax of 17 anesthetized dogs to measure microvascular pressure. After intravenous pentobarbital sodium (25 mg/kg), we exposed the left lung through a wide left thoracotomy, which required rib excision. Through a double-lumen endotracheal tube, we ventilated the right lung to maintain normal blood gases and pH while we held the left lung motionless at an inflation pressure of 5 cmH2O. To reduce motion on the surface of the left lower lobe, we resected the left upper lobe, placed a Plexiglas baffle between the lobe and the heart, and held the lobe surface in a suction ring. In accordance with procedures we have previously described, we micropunctured subpleural vessels to measure microvascular pressure. At base line when alveolar pressure exceeded left atrial pressure (zone 2 conditions), 21, 38, and 41% of the total pressure drop occurred, respectively, in the arterial, microvascular, and venous segments. When we raised left atrial pressure above alveolar pressure (zone 3 conditions), the corresponding pressure drops were 30, 55, and 20% of total. The blood flow in the superficial layer of the lung averaged 15% less than the flow in the deeper layers as measured by distribution of 99mTc-albumin macroaggregates. We conclude that the intact and the isolated lung preparations in dog exhibit similar distributions of subpleural microvascular pressure.
Authors:
J M Shepard; M A Gropper; G Nicolaysen; N C Staub; J Bhattacharya
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  64     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1988 Feb 
Date Detail:
Created Date:  1988-06-27     Completed Date:  1988-06-27     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  874-9     Citation Subset:  IM    
Affiliation:
Cardiovascular Research Institute, University of California, San Francisco 94143.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure*
Dogs
Lung / blood supply*
Microcirculation
Pulmonary Circulation*
Punctures
Grant Support
ID/Acronym/Agency:
HL-07192/HL/NHLBI NIH HHS; HL-25548/HL/NHLBI NIH HHS; HL-36024/HL/NHLBI NIH HHS

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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